package java51_17;

public class IntTest {

	public static void main(String[] args) {
		Integer i = new Integer("111");
		System.out.println(i);
		Integer k = 100;// 装箱
		int f = i;// 拆箱
		k++;
		System.out.println(k);

		Integer m = null;
		// int n = null;

	}

}
